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JDK 21 is a long-term support release of Java that changes how you can write programs. Project Amber has delivered pattern matching features that make the switch construct significantly more expressive, so using custom data types gets much less verbose. Project Loom has delivered a new implementation of threads that allows asynchronous programs to be written in a synchronous style, so traditional concurrent programs become more scalable.

introduces new language features and APIs. We take a closer look at the following topics.

• Pattern Matching
• Virtual Threads
• Sequenced Collections
• String Templates